Wash or coating for ingot molds



Patented Nov. 20, 1928.

bm'rso' STATES 'PATET OFFICE.

JOHN W. ALDEN, OF-CANTON, OHIO, ASSIG-NOR TO CENTRAL ALLOY STEEL CORPORA- TION, OF NEW YORK, N. Y., A. CQBPORATIUN OF NEW YORK.

WASH OR COATHTG FOR INGOT HOLDS.

1R0 Drawing.

The invention relates to a plastic coatin or wash adapted to be sprayed or paints upon the interior of ingot molds to produce a repellent action against thesplash of mob 5 ten steel poured from the ladle into the mold, The invention is particularly adapted for top pouring wherein the liquid steel or other metal is poured through a nozzle in the ladle, from a considerable height, into the mold to In ordinary practice, even with the greatest care, there is a considerable splash of this molten metal against the inner Walls of the ingot mold, forming pellets which quickly fieeze and stick to the mold, and when the it molten steel rises above these pellets surface defects. are thus formed upon the ingot. It is also common for,surface defects to be formedupon the ingot by waves or ourrents which are set up in the mold during 26? the pouring of the molten steel, these waves .or currents being caused by the molten metal boiling up at one placeor another as it rises in the mold and if these waves or currents adhere to the side wall of the mold, a surrace defect is formed on the in ct and upon the result-ant billet or bloom. ll such surface defects must be chipped from the ingots, billets or blooms, this chipping requiring considerable time and expense.

The object of the present invention is to provide a coating or wash adapted to be applied to the interior of an ingot mold, either by a brush or spra gun, for the purpose of producing'a repe ent action against the splash and waves or currents of the molten steel t6 prevent the same from sticking or freezing upon the sides of the mold and forming snriace defects, in the ingot or the resultantbloom oi billet.

-This wash or coating preferably consists of a mixture of commerc al aluminum powder and tar with a binder and may be thinnedv or diluted with a suflicient amount of water to permit of the same being easily applied to the interior surface of the mold by a brush or spray a The preferred ii-oportions and manner of preparing the coating or wash consists in mixing seven parts of commercial aluminum powder, three parts of commercial molasses, or sodium silicate, kerosene, or other binder Application flied. January 19, 1926. Serial No. 82,377,

of the steel and has a oleoxidizing efiect upon the surface of the molten steel which forms the surface of the ingot.

The'tar produces a slight smoke as the level a layer of carbon or soot upon the sides of the mold which assists in the repellent action of the splash or waves of molten metal.

It has been found by commercial practice that this wash or coating when properly mixed and applied to the interior of ingot molds with suflicient temperature to dry out the moisture (approximately 212 F.) and with a reasonably clean stream of molten metal it will to a great extent produce an inof the molten steel rises in the mold, forming got having a surface tree from defects, thus lmproving the ingot and considerably reducing the expenditure of labor and money to remove the defects.

I-claim:

1. The herein described coating for ingot molds comprising a mixture of commercial aluminum powder and tar.

2. The herein described coating for ingot molds comprising a mixture. of commercial aluminum powder, tar and a suitable binder.

3. The herein described coatin got molds comprising a mixture 0 commercial aluminum, tar and'molasses.

4. The herein described coating for ingot molds comprising a mixture of commercial aluminum powder, tar, a suitable binder, and water.

5. The herein described coating for ingot molds comprising a mixture consisting of seven parts of commercial aluminum powforinder, three parts of molasses, seven parts of water and five parts of tar.

6. The process of producing a coating for ingot molds which consists in mixing seven 5 parts of commercial aluminum powder, three parts of molasses and seven parts of water,

steaming and mixing thoroughly until the Y mes es mixture assumes the appearance of mercury and then adding five parts of melted tar and stirring thoroughly.

In testimony that I claim the above, I have hereunto subscribed my name.

JOHN :W. ALDEN. 

